Method of reducing artefacts in images formed by means of Fourie

Details Method of reducing artefacts in images formed by means of Fourie Method of reducing artefacts in images formed by means of Fourie

1986-01-23

1987-11-10

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

324313, G01R 3320

Patent

active

047060239

ABSTRACT:
NMR images formed by means of Fourier zeugmatography contain disturbing artefacts which are caused by coherent interference signals (for example, off-set signals, non-ideal 180.degree. reversing pulses). In accordance with the invention, an additional phase difference (.DELTA..phi.=.pi. in the case of even rows, and .DELTA..phi.=.pi.. (m-1)/m rad/sec in the case of m odd rows) is generated and the signal samples taken from the resonance signals are stored in adjacently situated rows of an image frequency matrix. The values in every second row of the matrix are changed to cancel said additional phase-difference, so that the contributions of the coherent interference signals to the matrix are influenced by the additional phase shift; if the additional phase shift is .pi. rad/sec, the values of every second row of interference signals in the direction of the columns are simply inverted. During Fourier transormation of the columns, therefore, the artefacts caused by the interference signals are shifted towards the border of the image.

REFERENCES:
patent: 4214202 (1980-07-01), Bonori
patent: 4593248 (1986-06-01), Hyde et al.
patent: 4621235 (1986-11-01), Van Uijen

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